Forbidden Zone Geocaches
 
   
 
FBZ Missions
  
 
  · Stone of the Lost Valley
· The Bunkers
· Mission Gorge
· Rock River Burial Mound
· Supernatural Supernova
· Little Green Men
· The Forbidden Zone
· The Doomsday Bomb
· The Monkey's Triangle
· Warlock Mine
  
 


 
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Don't have an account yet? You can create one. As a registered user you have advantages such as the ability to display and track your Operation Silverback progress, earn points, upload images, and post comments in the forum.
  
 


 
Journal Entries
  
 
 
· The Fool in the Rain [8/25/25]
· Reporting for Duty [2/24/25]
· Introduction [3/29/23] Normal.gif

[ More in Journal Section ]
  
 


 
Silverback Cipher
  
 
 
Silverback hunters should be familiar with the “pigpen” or masonic cipher, which is a simple substitution cipher exchanging letters for symbols based on a grid.

This cipher can be used to decrypt directions and secret codewords at FBZ geocaches!
  
 


 
External Links
  
 
  · 1: The CIA Vault
· 2: The FBI Vault
· 3: Project Blue Book
· 4: Aliens the Truth
· 5: The Black Vault
  
 


 << SGTF Special Operations
POTAM Discovery
Geocaching Reference Number TB9G62G

Worth 10 Points (Create an account to enter TB tracking number and earn points!)

 
POTAM Discovery Tracking Bug ImageYour TOP SECRET mission (codename DISCOVERY) is to further this Special Reconnaissance (SR) evidence through any means possible to help it reach its destination at N 47° 23.514 W 121° 27.305 (GC1169), the "Project A.P.E." Mission 9 Tunnel of Light Command Center.

Its discovery is worth 10 points towards an operative's rank on fbz.geocaches.org!
  
   
     

Operatives who have logged this TB...

  Zero (0) personnel as of 04/18/26 @ 2:49 PM
   

 


*Disclaimer: Stories here and at FBZ caches are a combination of historical conjecture, anecdote and pure fiction. Any similarity to any event, group, or person living or dead is merely coincidental. Additionally, SGTF has utilized a variety of signs/stickers as props in the FBZ geocaching series. Labels or warnings (e.g. biohazard, radioactive, etc.) which are fictitious will display some form of the SGTF/Silverback moniker; all other warning signage encountered during this or any other FBZ adventure should be respected and observed as posted.


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   Operation Silverback Prize Ring SILVERBACK Prize Rings

Those who create an account on fbz.geocaches.org and enter mission codewords and POTAM tracking bug numbers receive points towards an Operative ranking. Operatives who achieve the rank of General (700 points) are eligible to receive an official silver Operation Silverback GC.com trackable ring from Oakcoins. Gold rings are available for those who reach the rank of Green Beret (or higher).